How to connect MyCloud 2TB to Mac for faster transfer

You don’t say what type of wireless connection you have, but if the connection often breaks, you issues there that you should probably look in to - 5Ghz should not be that bad.
If you are comfortable with SSH, you could also modify the smb-global.conf to optimize for Macs per my earlier post https://community.wd.com/t/solved-tweaking-samba-smb2-for-mac-androids/236189